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<a name="1" href="#1">1</a>   <strong class="jxr_keyword">package</strong> org.slf4j.profiler;
<a name="2" href="#2">2</a>   
<a name="3" href="#3">3</a>   
<a name="4" href="#4">4</a>   
<a name="5" href="#5">5</a>   <em class="jxr_javadoccomment">/**</em>
<a name="6" href="#6">6</a>   <em class="jxr_javadoccomment"> * </em>
<a name="7" href="#7">7</a>   <em class="jxr_javadoccomment"> * This demo illustrates usage of SLF4J profilers.</em>
<a name="8" href="#8">8</a>   <em class="jxr_javadoccomment"> * </em>
<a name="9" href="#9">9</a>   <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a name="10" href="#10">10</a>  <em class="jxr_javadoccomment"> * We have been given the task of generating a large number, say N, </em>
<a name="11" href="#11">11</a>  <em class="jxr_javadoccomment"> * of random integers. We need to transform that array into a smaller array</em>
<a name="12" href="#12">12</a>  <em class="jxr_javadoccomment"> * containing only prime numbers. The new array has to be sorted.</em>
<a name="13" href="#13">13</a>  <em class="jxr_javadoccomment"> * </em>
<a name="14" href="#14">14</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a name="15" href="#15">15</a>  <em class="jxr_javadoccomment"> * While tackling this problem, we would like to measure the</em>
<a name="16" href="#16">16</a>  <em class="jxr_javadoccomment"> * time spent in each subtask.</em>
<a name="17" href="#17">17</a>  <em class="jxr_javadoccomment"> * </em>
<a name="18" href="#18">18</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a name="19" href="#19">19</a>  <em class="jxr_javadoccomment"> * A typical output for this demo would be:</em>
<a name="20" href="#20">20</a>  <em class="jxr_javadoccomment"> &lt;pre&gt;</em>
<a name="21" href="#21">21</a>  <em class="jxr_javadoccomment"> + Profiler [DEMO]</em>
<a name="22" href="#22">22</a>  <em class="jxr_javadoccomment">|-- elapsed time                       [RANDOM]     0.089  seconds.</em>
<a name="23" href="#23">23</a>  <em class="jxr_javadoccomment">|---+ Profiler [SORT_AND_PRUNE]</em>
<a name="24" href="#24">24</a>  <em class="jxr_javadoccomment">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;|-- elapsed time                         [SORT]     0.221  seconds.</em>
<a name="25" href="#25">25</a>  <em class="jxr_javadoccomment">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;|-- elapsed time             [PRUNE_COMPOSITES]    11.567  seconds.</em>
<a name="26" href="#26">26</a>  <em class="jxr_javadoccomment">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;|-- Subtotal                   [SORT_AND_PRUNE]    11.788  seconds.</em>
<a name="27" href="#27">27</a>  <em class="jxr_javadoccomment">|-- elapsed time               [SORT_AND_PRUNE]    11.788  seconds.</em>
<a name="28" href="#28">28</a>  <em class="jxr_javadoccomment">|-- Total                                [DEMO]    11.877  seconds.</em>
<a name="29" href="#29">29</a>  <em class="jxr_javadoccomment">&lt;/pre&gt;</em>
<a name="30" href="#30">30</a>  <em class="jxr_javadoccomment"> * </em>
<a name="31" href="#31">31</a>  <em class="jxr_javadoccomment"> * @author Ceki Gulcu</em>
<a name="32" href="#32">32</a>  <em class="jxr_javadoccomment"> */</em>
<a name="33" href="#33">33</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../org/slf4j/profiler/NestedProfilerDemo.html">NestedProfilerDemo</a> {
<a name="34" href="#34">34</a>    
<a name="35" href="#35">35</a>    <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> main(String[] args) {
<a name="36" href="#36">36</a>      <em class="jxr_comment">// create a profiler called "DEMO"</em>
<a name="37" href="#37">37</a>      Profiler profiler = <strong class="jxr_keyword">new</strong> Profiler(<span class="jxr_string">"DEMO"</span>);
<a name="38" href="#38">38</a>      
<a name="39" href="#39">39</a>      <em class="jxr_comment">// register this profiler in the thread context's profiler registry</em>
<a name="40" href="#40">40</a>      ProfilerRegistry profilerRegistry = ProfilerRegistry.getThreadContextInstance();
<a name="41" href="#41">41</a>      profiler.registerWith(profilerRegistry);
<a name="42" href="#42">42</a>      
<a name="43" href="#43">43</a>      <em class="jxr_comment">// start a stopwatch called "RANDOM"</em>
<a name="44" href="#44">44</a>      profiler.start(<span class="jxr_string">"RANDOM"</span>);
<a name="45" href="#45">45</a>      <a href="../../../org/slf4j/profiler/RandomIntegerArrayGenerator.html">RandomIntegerArrayGenerator</a> riaGenerator = <strong class="jxr_keyword">new</strong> <a href="../../../org/slf4j/profiler/RandomIntegerArrayGenerator.html">RandomIntegerArrayGenerator</a>();
<a name="46" href="#46">46</a>      <strong class="jxr_keyword">int</strong> n = 10*1000;
<a name="47" href="#47">47</a>      <strong class="jxr_keyword">int</strong>[] randomArray = riaGenerator.generate(n);
<a name="48" href="#48">48</a>      
<a name="49" href="#49">49</a>      <em class="jxr_comment">// create and start a nested profiler called "SORT_AND_PRUNE"</em>
<a name="50" href="#50">50</a>      <em class="jxr_comment">// By virtue of its parent-child relationship with the "DEMO"</em>
<a name="51" href="#51">51</a>      <em class="jxr_comment">// profiler, and the previous registration of the parent profiler, </em>
<a name="52" href="#52">52</a>      <em class="jxr_comment">// this nested profiler will be automatically registered</em>
<a name="53" href="#53">53</a>      <em class="jxr_comment">// with the thread context's profiler registry</em>
<a name="54" href="#54">54</a>      profiler.startNested(SortAndPruneComposites.NESTED_PROFILER_NAME);
<a name="55" href="#55">55</a>      
<a name="56" href="#56">56</a>      <a href="../../../org/slf4j/profiler/SortAndPruneComposites.html">SortAndPruneComposites</a> pruner = <strong class="jxr_keyword">new</strong> <a href="../../../org/slf4j/profiler/SortAndPruneComposites.html">SortAndPruneComposites</a>(randomArray);
<a name="57" href="#57">57</a>      pruner.sortAndPruneComposites();
<a name="58" href="#58">58</a>      
<a name="59" href="#59">59</a>      <em class="jxr_comment">// stop and print the "DEMO" printer</em>
<a name="60" href="#60">60</a>      profiler.stop().print();
<a name="61" href="#61">61</a>    }
<a name="62" href="#62">62</a>  }
</pre>
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